Pump-operating mechanism.



L. B. HALL. PUMP OPERATING MECHANISM. APPLICATION FILED JUNE 2?. 1917.

1,292,457. Patented Jan. 28, 1919.

' anism for varying ram R comprise LOUIS BENNET HALL, OF LONDON,ENGLAND.

PUMP-OPERATING- MECHANISM.

Specification of Letters Patent.

Application filed June 27, 1917. Serial No. 177,236.

To all whom it may concern:

Be it known that I, LOUIS BENNET HALL, a subject of the King of England,residing in London, England, have invented certain new andusefulImprovements in Pump-Opcrating Mechanisms, of which the following is afull, clear, and exact description, re'n erence being had to theaccompanying drawing, forming part of this specification, in which Ihave illustrated in section and partially in elevation one form of pumpand operating mechanism therefor which is arranged to feed liquid fuelto an internalcombustion engine, and in which the operating'mechanismfor actuating the pumpp1ston is controlled by a pressure-governor, whichis in turn controlled by the charge fed to the engine.

This invention relates to an improvement in pump-operating mechanisms,and is designed to provide a cheap and efficient mechthe throw of thepiston without varying the throw of the driving motor or actuatingmember.

The precise nature of my invention will be best understood by referenceto the accompanying drawings which will now be described, it beingpremised, however, that various changes may be made in the details ofconstruction and the general arrangement of the various parts, withoutdeparting from the spirit and scope of my invention, as defined in theappended. claims.

Referring to the structure shown in the figure, the reference charactersDP designate the fuel delivery passage to the engine and OP the fuelpump. IV is an inlet valve to the pump chamber and 0V is an outlet valvetherefrom, opening into the fuel'deliv-ery passage. Mounted forreciprocation in the pump casing is a ram or piston R, which is arrangedto be reciprocated by an eccentric E connected to a shaft which may beeither the engine crank shaft or a shaft driven therefrom. The drivingconnections between the eccentric E and the a slide block S mounted in aguide SB, and pivotally connected to this slide block S and the ram R isa walking beam, which is connected at one end to the eccentric and theslide block by a pin S, the other end B of the walking beam beingconnected to the ram R by means of a block V. This block V is pivoted tothe end of theram and is provided with an opening through which the endB of the walking beam is having a movable piston PP therein,

adapted to slide. The central portion of the walking beam extendsthrough an opening in a floating block FP, which is connected by meansof a pin P, with one end of a 16 Ver X connected to a shaft Y. Thisshaft Y is journaled in bearings in a casing K- whlch incloses the ramoperating mechanism, and is arranged to rock in its bearings when thefloating block is moved as hereinafter described, along the walking beamto vary the throw of the ram R. The osition of the floating block on thewal 'ng beam i arranged to be controlled by a controlling lever RR whichis pivotally connected to the floatin block by the pin P which connectssaid block to the lever X. One end of this controlling lever ER isprovided with a fork having pins therein which engage a groove betweenflanges C on a sleeve SL, which is arranged to be controlled by thepulsator as hereinafter described. The other end of the lever RR extendsthrough a pivoted sleeve PC", which is supported by links AL and L. Thelink AL is pivotally connected to the casing K at AP, while the link Lis pivotally connected to a crank M on a shaft M. This shaft M may berocked by any suitable controlling mechanism, or may be rocked by handthrough the medium of the lever connections shown in the figure toadjust the position of the sleeve PC", which constitute a shiftablepivot for the right-hand end of the controlling lever RR. V

The controlling or governing mechanism for the variable pump actuatingmechanism just described, comprises a compensating cylinder CS whichcontains a column of air, gas or any other compressible fluid and whichwill hereinafter be termed the air column. Movably mounted in the lowerend of this cylinderGS is a piston CP having a piston rod which extendsdownwardly thererom and connected to this piston (rod is the sleeve SL.Located within the sleeve SL and surrounding a hollow-stem D is a springSP which is arranged to be compressed by the column of .air

The piston rod in the piston OP extends downwardly to the hollow stemhead PO on the end thereof. Connected to the lower end of the rod CP isa wire or cable W through which the piston may be moved downwardly byhand, if desired. The pulsator comprises a cylinder P91 Patented Jan.28, 1919.

and has a inclosed within a casing CC is a cam M", which is connected toa shaft SH. This shaft SH is arranged to be actuated by the engine to besupplied, and the cam is provided with a groove which engages a rollerwill only be opened by the piston PP when it is at the extreme end ofits stroke. Jonnected to the cylinder PO and communlcating therewith bymeans of a port is a valve casing having a puppet valve RV mountedtherein, which is arranged to open and close communication between thecylinder PC and the pipe Q which is in communication with thecompensating cylinder CS. The valve RV is maintained on, its seat by aspring VS, held in position by a hollow nut VC. This valve is providedwith a downwardly extending stem ST which extends into the-casing CC. Tis a tappet within the casing CC which is arranged to be raised by a camVC on a shaft rotatably mounted in bearings on the casing CC. This shaftis arranged to be rotated by means of gears connecting it with the shaftSH.

During the operation of the engine the piston PP is reciprocated, and atthe lower end of each stroke the pressure in the cylinder PC isequalized with the pressure in the pipe p, and as the piston is movedup- 7 wardly toward the other end of its stroke,

I end to permit the equalization sure within the cylinde and at theother end to equalize the presthe valve RV will be openedby itsmechanism to equalize the pressure in the cylinder PC and the pressurein the compensate ing cylinder CS, and if there is any variation of theconditions, the piston GP inthe compensating cylinder will be moved inaccordance therewith. This movement of the piston CP will shift thecontrolling lever RR and accordingly vary the stroke of the plunger R.

The device just described, the cam M is provided with dwells to maintainthe piston CP stationary for a short period of time at both ends of itsstroke; at the one of the presand the pipe 39 sure in the cylinder POwiththe pressure in the compensating cylinder CS by opening the valve RVwhich is open when the piston PP is stationary, which will avoid thefluctuation of the piston CP except when changes in conditions occur. Ifthe valve were omitted the piston CP would be fluctuated in accordancewith the pulsation of the piston PP. 'The cam M may be one which is asimple circular eccentric. Even with such a cam the fluctuations ofpressure transmitted to the column in Q, from PC are only those whichoccur during the fraction of the stroke of PP during which the valve RVis open, and they are therefore much less than the whole range of thefluctuations in PC. If desired I may use another form of pulsator thanthat shown in the drawings, with which Imay use a valve structure suchas shown in Fig. 2, and in which the valve RV is arranged to be moved atthe endof the up stroke of the piston PP to equalize the pressure in thecylinder and an auxiliary chamber between the valve 'RV and a secondvalve SV which is normally held to its seat by a spring, and to thenequalize the pressure between the auxiliary chamber and the pipe Q byopening the valve SV after the valve RV has been closed. By means of aplurality of valves and an auxiliary chamber between the compensatingcylinder and the pulsating cylinder, I am enabled to overcome thepulsations of the pulsator even when using a continuously moving piston.

In the operation of the device, the pump is continuously operated by theeccentric E and the shaft SH is also continuously rotated to operate thepulsator and its valves. The crank shaft M may be adjusted to adjust oneend of the controlling lever RR, either automatically or by hand, whilethe other end of said ,lever is automatically adjusted by the pressurein the compensating cylinder OS to meet the various atmosphericconditions.

The advantages of my invention result from the provision of a pumpoperating mechanism, in which the throw of the iston of the pump may bereadily varied by two different sets of adjusting mechanisms withoutvarying the throw of the actuating member for the pump.

In the foregoing description, I have described the mechanism foroperating a pump adapted to be used in connection with fuel supplydevices for internal combustion englnes, such as shown in my co-pendinga plication Serial No. 177,237, filed June 2 1917, but it will bereadlly understood that the mechanism is applicable to plungers whichare to be reciprocated and in which the movement of the plunger is to bevaried without varying the throw of the actuating member.

I claim: Y

luPump operating mechanism, comprising a walking beam connected at oneend to the piston of the pump, means for actuating the other end of thewalking beam, a floating sets of adjusting mechanisms for ad usting.

the walking beam fulcrum for varying. the movement of the reciprocatingmember without varying the throw of the actuating means; substantiallyas described.

3. Pump operating mechanism, comprising a Walking beam connected at oneend to the piston of the pump, means for actuating the other end of thewalking beam, a floating fulcrum for the walking beam, a movable supportfor the fulcrum, a controlling lever pivotally connected to the fulcrumand the supporting shaft, link mechanism for adjusting one end of thecontrolling lever, and means for adjusting the other end of thecontrolling lever to vary the movement of the pump piston withoutaffecting the throw of the actuating mechanism; substantially asdescribed.

4. Pump operating mechanism, comprising a walking beam connected at oneen to an actuating member, a floating fulcrum for the walking beamthrough which the walking beam is adapted to slide, a second floatingfulcrum connecting the other end of the walking beam to the pump piston,a movable support for the floating fulcrum, and means for adjusting theposition of the floating fulcrum to vary the throw of the pump pistonwithout changing the throw of the actuating means; substantially asdescribed.

5. Pump operating mechanism, comprising a walking beam connected at oneend to an actuating member, a floating fulcrum for the walking beamthrough which the walkslide, a second floatthe other end of the amovable and a controlling lever PlVOttLllY connected to the movablesupport for the floating fulcrum, a sleeve slidably mounted on one endof the controlling lever, toggle levers connected to said sleeve, andlever mechanism connected to one of said toggle members for shifting thecontrolling lever; substantially as described.

6. Pump operating mechanism, comprising a walking beam connected at oneend to an actuating member, a floating fulcrum for the walking beamthrough which the walking beam is adapted to slide, a second floatingfulcrum connecting the other end of the walking beam to the pump piston,a movable support for the floating fulcrum, a controlling leverpivotally connected to the movable support for the floating fulcrum, asleeve slidably mounted on one end of the controlling lever, togglelevers connected to said sleeve, and lever mechanism connected to one ofsaid toggle members for shifting the controlling lever, together with asecond adjusting means for adjusting the position 0 stantially asdescribed.

f the other end of the controlling lever; su'b- 7. Pump operatingmechanism, comprisbeam connected at one end of the piston of the pump, afloating fulcrum for the walln'ng beam, a slide block connected to theother end of the walking beam, an eccentric for reciprocating the slideblock, a supporting lever for the floating fulcrum, a controlling leverpivotally connected to the supporting lever arranged to oscillate aboutthe axis of the floating fulcrum, link mechanism for adjusting one endof the controlling lever, and a pressure governor for adjusting theother end of the controlling lever; substantially as described.

In testimony whereof I have signed my ing a walking name to thisspecification.

LOUIS BENNET HALL.

